[心得] 懶人matrix
37 % self defined command
38 \newcommand{\mat}[2][rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr]{\left[
39 \begin{array}{#1}
40 #2\\
41 \end{array}
42 \right]}
使用時
\mat{a&b\\c&d}
不然要一直打array好麻煩 XD
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